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Magnetic and Structural Characterization of Nickel and Iron Based Heusler Ribbons Ni₂FeZ (Z = In, Sn, Sb)

100%
Frol'ová L., Ryba T., Vargová Z., Komanický V., Kováč J., Gyepes R., Varga R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
735-737
EN
Comparison of structural, chemical, and magnetic properties of Ni₂FeZ (Z = In, Sn, Sb) Heusler ribbons produced by melt-spinning method is presented. The aim of work was to prepare the Heusler alloys with the appropriate chemical composition in a single step without additional thermal treatment. Scanning electron microscopy analysis revealed polycrystalline structure of all samples. It is shown that correct L2₁ structure of Ni₂FeSb can be obtained in a single production step. On the other hand, no Heusler L2₁ phase (nor its variants) occur in Ni₂FeSn alloy. Additionally, magnetic characterization revealed high Curie temperatures of the Heusler phases (above 600 K for Ni₂FeSb and 800 K for Ni₂FeIn).
2
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Magnetic and Structural Characterization of NiXSb (X = Mn, Cr) Heusler Ribbon

100%
Ryba T., Vargova Z., Ilkovic S., Reiffers M., Kravcak J., Gyepes R., Varga R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
857-859
EN
Half-Heusler alloys with composition NiMnSb and NiCrSb have been prepared by rapid-quenching method. NiMnSb half-Heusler alloy is characterized by single phase C1_{b} with polycrystalline structure while crystalline structure of NiCrSb shows multiphase system. Magnetic measurements indicated high anisotropy and easy magnetization direction in the parallel direction with respect to ribbon axis for NiMnSb alloy while paramagnetic behavior appears for NiCrSb alloy down to 50 K.
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Structural and Magnetic Characterization of NiMnSb Half-Heusler Alloy Prepared by Rapid Quenching

84%
Ryba T., Vargova Z., Varga R., Ilkovic S., Reiffers M., Haskova V., Szabo P., Kravcak J., Gyepes R.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
206-207
EN
NiMnSb half-Heusler alloy in the form of a rod has been prepared by rapid quenching (suction-casting) method. The rod is characterized by single phase C1_b crystalline structure with lattice parameter a=5.982 Å. Magnetic measurements reveal an isotropic character of bulk NiMnSb alloy. Our study shows relatively high spin polarization of bulk NiMnSb in the range 35-50%.
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